Solid State Interlocking: Difference between revisions

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SSI (Solid State Interlocking) is the brand name of the first generation processor-based interlocking developed in the 1980s by British Rail, GEC-General Signal and Westinghouse Signals Ltd in the UK.

SSI utilises a 2-out-of-3 architecture, whereby all safety-critical functions are performed in three separate processing lanes and the results voted upon. An SSI consists of three Interlocking Processors or Main Processor Modules (MPMs), two Panel Processors and a Diagnostics Processor.

Geographic interlocking data, relating to the area of railway under control, is installed using EPROMs contained in plug in memory modules. The interlocking program contained in each of the MPMs interprets this data to allow safe passage of trains through its area of control.

SSI is widely installed within Great Britain, and has some penetration of other Western European markets.

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 SSI (Solid State Interlocking) is the brand name of the first generation processor-based [[Interlocking|interlocking]] developed in the [[1980s]] by [[British Rail]], [[Alstom|GEC-General Signal]] and [[Westinghouse Rail Systems|Westinghouse Signals Ltd]] in the UK.
-SSI utilises a 2-out-of-3 architecture, whereby all safety-critical functions are performed in three separate processing lanes and the results 'voted' upon. An SSI consists of three Interlocking Processors or Main Processor Modules (MPMs), two Panel Processors and a Diagnostics Processor.
+SSI utilises a 2-out-of-3 architecture, whereby all [[Life-critical system|safety-critical]] functions are performed in three separate processing lanes and the results voted upon. An SSI consists of three Interlocking Processors or Main Processor Modules (MPMs), two Panel Processors and a Diagnostics Processor.
+Geographic interlocking data, relating to the area of railway under control, is installed using [[EPROM]]s contained in plug in memory modules. The interlocking program contained in each of the MPMs interprets this data to allow safe passage of trains through its area of control.
-SSI is widely installed within the UK, and has some penetration of other Western European markets.
+SSI is widely installed within [[Great Britain]], and has some penetration of other [[Western Europe|Western European]] markets.